Improvement in compression-cocks



W. DODD. v(fompresgiU11-Cook.

N. 197,837. Parente-d Dc. 4, 1877.

Wmmssms UNITED STATES PATENT OEEIoE.

WILLIAM Donn, or NEw YORK, Nr., AssIGNoR To CHARLES EARRIsoN, or sAMEPLACE.

IMPROVEMENT IN COMPRESSlON-COC'KS.

Specification forming part of Letters Patent No. 197,837, dated-December4, 1877; application filed v July 18, 1877.

.chaniber cap, which, to -that end, is provided with a deep recess forcontaining the collars and the filamentous packing surrounding thevalve-stem.

l The mode of operation of the part-s is such that when the cap isscrewed home upon the end of the valve-chamber, the loosecollars uponthe valve-stem are crowded together, andv the filamentous packing isthus compressed and expanded laterally against the valve-stem in onedirection, and against the wall of the recess in the opposite direction.

The object of this mode of packing the valve-stem is to obtain a jointwhich will resist the action of hot as well as cold water.

The accompanying drawing represents acentral longitudinal sectionthrough the valvestein and chamber of a compression-cock containing myinvention.

The cock is of the usual construction, having an annular valve-seat, a.The valve-plug b is moved up and down by the screw-thread upon thelowervportion ofthe valve-stem c. An annular' shoulder, rl, is formednear the upper end of the inner wall of the valve-chamber, for thesupport of a metallic washer, d. The valve-stem is provided with aprojecting shoulder', c, which rests upon thewasher d'. Out-side theshoulder c is the elastic packingring c, which packs the joint betweenthe upper end of the valve-chamber and the cap f. rlhe upper end of t-hevalve-chamber is provided with a male screw-thread, which engages afemale thread, f', upon the interior of the cap f. The cap f iscounterbored, as shown, -in the usual way, for the purpose of embracingthe top of the valve-chamber, and containing the annular packing-ring e.A deep cylindrical recess of smaller diameter is formed in the cap, toadmit the upper portion of the shoulder c of the valve-stem, and alsothe loose metallic collars g and g2, together with the lilamentouspacking g, which `is wound upon the valve-stem between the collars g andg2.

The collars g and g2 and the filamentous packing gl constitute, inconnection with the deep recess in the cap, a stuffing-box, by means ofwhich a water-tight joint is made for the valvestem. l I It will be seenthat when the several parts are in position the shoulder c' on thevalvestein is supported by the metallic washer d. The lower collar g ofthe stuffing-box rests upon the shoulder c', and the filamentous packinggl, between the lower collar g and the upper collar g2, is compressed bythe pressure of the shoulder g3 upon the collar g'2 when the cap isscrewed down upon the valve-chamber. When thus compressed, theilamentous packing gI is expanded radially, in one direction againstthevvalve-stem, andin the other against the annular wall ofthe recess inthe cap, The

loose collars g and gl serve as guides during the process of winding thelamentous packing upon the valve-stem, and afford a convenient means ofconfining the filaments so 4 as described, avalve-chamber cap, recessedsubl stantially as shown, in combination with the loose collars g and q2upon the valve-stem, and the filamentous packing g', wound upon thevalve-stem between the collars g and g2, and adapted to be compressedthereby, to form a water-tightjoint between the stem and the cap,

when the cap is screwed home upon the end of the valve-chamber,substantially as set forth.

WM. DODD. Witnesses:

BORT. C. HARRISON, GEO. E. POOLE. Y

